MySQLi(MySQL Improved Extension)是PHP 5及以上版本中用于与MySQL数据库进行交互的扩展。它是MySQL扩展的增强版,提供了更多的功能和更好的性能。
MySQLi主要有两种使用方式:
MySQLi适用于所有需要与MySQL数据库进行交互的场景,包括但不限于:
随着PHP版本的更新,MySQL扩展已经被废弃,推荐使用MySQLi或PDO_MySQL。MySQLi提供了更多的功能和更好的性能。
以下是一个简单的示例,展示如何将MySQL代码迁移到MySQLi:
$connection = mysql_connect("localhost", "user", "password");
mysql_select_db("database", $connection);
$result = mysql_query("SELECT * FROM table");
while ($row = mysql_fetch_assoc($result)) {
echo $row['column'];
}
mysql_close($connection);
$connection = mysqli_connect("localhost", "user", "password", "database");
if (!$connection) {
die("Connection failed: " . mysqli_connect_error());
}
$result = mysqli_query($connection, "SELECT * FROM table");
while ($row = mysqli_fetch_assoc($result)) {
echo $row['column'];
}
mysqli_close($connection);
$connection = mysqli_connect("localhost", "user", "password", "database");
if (!$connection) {
die("Connection failed: " . mysqli_connect_error());
}
$stmt = mysqli_prepare($connection, "SELECT * FROM table WHERE id = ?");
mysqli_stmt_bind_param($stmt, "i", $id);
$id = 1;
mysqli_stmt_execute($stmt);
$result = mysqli_stmt_get_result($stmt);
while ($row = mysqli_fetch_assoc($result)) {
echo $row['column'];
}
mysqli_stmt_close($stmt);
mysqli_close($connection);
通过以上步骤和示例代码,你可以顺利地将MySQL代码迁移到MySQLi,并利用其提供的更多功能和更好的性能来提升应用程序的质量和安全性。
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